memory_get_peak_usage()

(PHP 5 >= 5.2.0, PHP 7)

返回分配给 PHP 内存的峰值

说明

memory_get_peak_usage([bool $real_usage= false]): int

返回分配给你的 PHP 脚本的内存峰值字节数。

参数

$real_usage

如果设置为TRUE可以获取从系统分配到的真实内存尺寸。如果未设置，或者设置为FALSE，仅会报告emalloc()使用的内存。

返回值

返回内存峰值的字节数。

更新日志

参见

• memory_get_usage() 返回分配给 PHP 的内存量
• memory_limit

memory_get_peak_usage() is used to retrieve the highest memory usage of PHP (or your running script) only. If you need the overall memory usage of the entire system, following function might be helpful. If retrieves the memory usage either in percent (without the percent sign) or in bytes by returning an array with free and overall memory of your system. Tested with Windows (7) and Linux (on an Raspberry Pi 2):
<?php
  // Returns used memory (either in percent (without percent sign) or free and overall in bytes)
  function getServerMemoryUsage($getPercentage=true)
  {
    $memoryTotal = null;
    $memoryFree = null;
    if (stristr(PHP_OS, "win")) {
      // Get total physical memory (this is in bytes)
      $cmd = "wmic ComputerSystem get TotalPhysicalMemory";
      @exec($cmd, $outputTotalPhysicalMemory);
      // Get free physical memory (this is in kibibytes!)
      $cmd = "wmic OS get FreePhysicalMemory";
      @exec($cmd, $outputFreePhysicalMemory);
      if ($outputTotalPhysicalMemory && $outputFreePhysicalMemory) {
        // Find total value
        foreach ($outputTotalPhysicalMemory as $line) {
          if ($line && preg_match("/^[0-9]+\$/", $line)) {
            $memoryTotal = $line;
            break;
          }
        }
        // Find free value
        foreach ($outputFreePhysicalMemory as $line) {
          if ($line && preg_match("/^[0-9]+\$/", $line)) {
            $memoryFree = $line;
            $memoryFree *= 1024; // convert from kibibytes to bytes
            break;
          }
        }
      }
    }
    else
    {
      if (is_readable("/proc/meminfo"))
      {
        $stats = @file_get_contents("/proc/meminfo");
        if ($stats !== false) {
          // Separate lines
          $stats = str_replace(array("\r\n", "\n\r", "\r"), "\n", $stats);
          $stats = explode("\n", $stats);
          // Separate values and find correct lines for total and free mem
          foreach ($stats as $statLine) {
            $statLineData = explode(":", trim($statLine));
            //
            // Extract size (TODO: It seems that (at least) the two values for total and free memory have the unit "kB" always. Is this correct?
            //
            // Total memory
            if (count($statLineData) == 2 && trim($statLineData[0]) == "MemTotal") {
              $memoryTotal = trim($statLineData[1]);
              $memoryTotal = explode(" ", $memoryTotal);
              $memoryTotal = $memoryTotal[0];
              $memoryTotal *= 1024; // convert from kibibytes to bytes
            }
            // Free memory
            if (count($statLineData) == 2 && trim($statLineData[0]) == "MemFree") {
              $memoryFree = trim($statLineData[1]);
              $memoryFree = explode(" ", $memoryFree);
              $memoryFree = $memoryFree[0];
              $memoryFree *= 1024; // convert from kibibytes to bytes
            }
          }
        }
      }
    }
    if (is_null($memoryTotal) || is_null($memoryFree)) {
      return null;
    } else {
      if ($getPercentage) {
        return (100 - ($memoryFree * 100 / $memoryTotal));
      } else {
        return array(
          "total" => $memoryTotal,
          "free" => $memoryFree,
        );
      }
    }
  }
  function getNiceFileSize($bytes, $binaryPrefix=true) {
    if ($binaryPrefix) {
      $unit=array('B','KiB','MiB','GiB','TiB','PiB');
      if ($bytes==0) return '0 ' . $unit[0];
      return @round($bytes/pow(1024,($i=floor(log($bytes,1024)))),2) .' '. (isset($unit[$i]) ? $unit[$i] : 'B');
    } else {
      $unit=array('B','KB','MB','GB','TB','PB');
      if ($bytes==0) return '0 ' . $unit[0];
      return @round($bytes/pow(1000,($i=floor(log($bytes,1000)))),2) .' '. (isset($unit[$i]) ? $unit[$i] : 'B');
    }
  }
  // Memory usage: 4.55 GiB / 23.91 GiB (19.013557664178%)
  $memUsage = getServerMemoryUsage(false);
  echo sprintf("Memory usage: %s / %s (%s%%)",
    getNiceFileSize($memUsage["total"] - $memUsage["free"]),
    getNiceFileSize($memUsage["total"]),
    getServerMemoryUsage(true)
  );
?>
The function getNiceFileSize() is not required. Just used to shorten size in bytes.
Note: If you need the server load (CPU usage), I wrote a nice function to get that too: http://php.net/manual/en/function.sys-getloadavg.php#118673